1131312021811 has 2 divisors, whose sum is σ = 1131312021812. Its totient is φ = 1131312021810.

The previous prime is 1131312021799. The next prime is 1131312021821. The reversal of 1131312021811 is 1181202131311.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (1181202131311) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1131312021811 - 2⁹ = 1131312021299 is a prime.

It is a super-3 number, since 3×1131312021811³ (a number of 37 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (1131312021821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 565656010905 + 565656010906.

It is an arithmetic number, because the mean of its divisors is an integer number (565656010906).

Almost surely, 2^{1131312021811} is an apocalyptic number.

1131312021811 is a deficient number, since it is larger than the sum of its proper divisors (1).

1131312021811 is an equidigital number, since it uses as much as digits as its factorization.

1131312021811 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 25.

The spelling of 1131312021811 in words is "one trillion, one hundred thirty-one billion, three hundred twelve million, twenty-one thousand, eight hundred eleven".